Rotary compressor



March 22,1932,y l HORAWA 1,850,394

RTARY COMPRESSOR Filed March 5, 1928 Patented Mar. Z2, 1932 UNITEDV STATES- FRANK HORAWA, OF

DETROIT, MICHIGAN ROTARY COMPRESSOR i Application filed-March 5,

The present invention pertains to a novel construction in rotary air compressors'and has as a general object the construction of a compressor with suitable check valves con-A trolling the intake and the exhaust communicating with the compression cylinder.y

The pressure forming piston is constructed of smaller diameter than the compression cylinder and is connected in a resilient manner to an eccentric drive shaft, and a partition is provided to prevent the rotation of the piston. The resiliency of this member compensates for any wear on the inner periphery of the compression cylinder or on the outer periphery of the piston, and such compensation constitutes one of the special objects of the invention.

A further object is to construct the interior compression cylinder and the piston in such a manner that oil may be freely supplied to all moving parts.

A still further object is to form an enclosing casing in such a manner that part of the casing is used as an oil retainer and part being used as a pressure reservoir.

The manner in which these objects are carried out is fully disclosed by way of ex` ample in the following description with reference to the accompanying drawings, in which- Figure 1 is a vertical cross section through my rotary compressor; and

Fig. 2 is a cross section on the line 2--2, Figure 1.

The compressor is enclosed in a casing 1 provided with a base 2 suitable for attachment to the floor. The casing is formed in the shape of a drum having its edges upturned to form the flange 3 to which the enclosing end plates 4 are attached by means of the bolts 5.

The end plates 4 are constructed with journals 6 enclosing bearings? in which a driven shaft 8 is mounted. rlhe journals are constructed with oil wells 9 communicating .with the bearings 7 through the ports 10. e f

The driven shaft 8 is reduced at 11, forming a shoulder against which a metal seal 12`is retained by the cap 13 screwed on the outwardly extending portion 14 of the end plate 1928. Serial No. 259,055.

4. At the opposite end of the shaft the extension 15 of the end plate is internally threaded and retains the cap 16. The cap 16 is recessed as at 17 to retain the end of a compressed spring 18 which supports a floating member 19 retaining a ball 20 in contact with the countersunk end of the driven shaft 8 and thereby preventing any endwise play.

The driven shaft 8 is provided with an eccentric portion 21 and surrounding this eccentric is a journal 22 having an oil port 22. The journal is outwardly flanged forming a disc or ring 23 which is adapted to butt against the end of a drum 24 which is sup` ported by inner flanges 25 on the casing 1. The ring 26 is secured to the opposite side of the drum 24 by means of bolts 27 and thereby a pressure chamber 28 is formed upon the installation of a piston 29 adapted to t between the ring 23 and the ring 26. A spiral spring 30 having certain spirals 31 adapted to engage the journal 22 and certain other spirals 32 to engage the inner periphery of the piston 29, provides a driving connection between the eccentric 21 and the piston 29. A partition 33 is attached to the piston by the screws 34 and extends into the recess 35 in the drum 24. The pressure of the spring 30 against the piston 29 as it rotates is suiliy cient to insure contact at some point between the partition 33 and the wall of the recess 35.

An intake 38 communicates with the compression chamber by means of a port 39 in the casing 1 registering with a port 4() in the ring 24. The port 40 is provided with an enlarged bore 41 into which is screwed a nut 42 which forms a seat for a diaphragm 43 and thus allows air to pass in but one direction. An exhaust port 44 in the ring 24 contains a check valve similar to the intake valve described except the diaphragm 43 is reversed and thereby allows the air to exhaust through that port.

A channel 45 is formed between the casing l and the ring 24 with which the outlet port 44 is in communication and also with exhaust outlet- 46 which might also be used as a pressure reservoir.

Brieiiy the operation is as follows. The shaft 8 is driven by any suitable means (not shown) :andthe eccentric 21, Yexerting presli sure on the piston 29 through theournal 22 and the spring 30, causes the piston to' con tact with the inner periphery'of the'drum 24.

-The partition 33 provides ar dividing means whereby the space on either side of this con-` tact' point between the piston andthe drum is dividedinto two parts or pockets. As the eccentric oscillates this contact point is moved in the direction of the oscillation, and the stationary partition traps the air. vAsthe pocket grows smaller the air is compressed therein and is forced from the pocket-through the port 44 on one side of the partition. On

the other side the enlarging pocket reduces the pressure and' draws air through the intake port; -Inthis mannerthe air is trapped in the ycompression chamber by the checky valvesl and is forced out through the exhaust -port-by the oscillation of the piston. Obvi-k 'i o usly the device may be used for compressing or pumping other fluids.

The manner in which thepiston is connected to the eccentric by the spring 30 allows a structure wherein one end may be` left open, asjthe ring 26, and through this opening the y i lubricant may be supplied to all moving parts anddirectly inside the piston 29. If any oil is discharged with ythe compressed fluid, it settles in the chamber 46 and returns to the moving parts, througha port 47 in the bottom of the chamber.

, Although a specificl embodiment ofimy inf diameter than the interior of said drum, and

an open cylindrical spring having the convolutions thereof spiralled around said ec,

ycentric'shaft, said spring having convolutions of varied diameters with certain thereof contacting with the eccentric shaft and the remainder engaging the inner -wallof said plston. t

'2. In a rotary compressor, a caslng, end

plates attached to said casing, a drum mounted in said casing,end closures for said drum, an eccentric shaft ]ournalled 1n ysald end t plates, a piston mounted in vsaid'drum, said pistonhaving a smaller exterior diameter thanithe interior of said drum, an open'cy-k lindrical spring having the convolutions thereof spiraled around said eccentric shaft, said spring having convolutions of varied diameters with certain. thereof contacting Vwith the eccentric shaft and the remainder yengaging the inner wall of said piston, and

means for preventing the rotation of said piston.

' 3. In a rotary compressor, a casing, a. drum mounted in said casing, `end plates attached to said casing, aneccentric shaft mounted in said end plates, a disk journalled on said eccentric shaft and abutting said drum and ,formingv an end closure, a ring attached to thefopposite end of said drum and forming the opposite end closure, a piston mounted in ysaid drum and between said end closures, said piston havingk a ,smaller exterior diameter than the interior of the drum, a partition,an

inlet valve,.an outlet valve,l said valves being positionedL on opposite sides of said partition, and y anfopen ycylindrical spring havin theLconvolutionsj thereof spiralledV around saideceentric shaft,said spring having convolutions yof varied ydiameters with certain v thereof contactingl withithe eccentric shaft and the remainder engagingthe inner wall of said piston.r y' y V 4,1 In arotary compressor, av casing,.end plates* attached to said casing, an eccentric shaft mountedin said endplates, a,y compression chamber, apiston in said compressiony chamber, aL partition in said compression chamber and in connection with saidpiston, said partition and piston dividing said chamber into two pockets, and an opencylindrical spring having the convolutions thereof spiralled around said eccentric shaft, said "spring having convolutions of varied diameters with certain thereof contacting withthe eccentric shaftl and the remainder engaging the inner wallk of said piston. v v y y y5. In a yrotary compressor, afcasing, end plates attached to4 said casing, an eccentric shaftjournalled in saidend plates, a drum mounted in said casing, a ringj attached tok said drum, a disk mounted lony said eccentric shaft, apiston mounted in said drum between said ring and said disk, said piston having a smaller exterior diameter than the interior ofl said drum, a partitionunounted in said drum and ,connected to said piston, and an open cylindrical spring having the convolu-V tionsr' thereof spiral-led around said eccentric shaft, said spring yhaving convolutions of f varied diameters with certain thereof con,- tactingv with the eccentric shaft and the re`y mainder engagingvthe, inner; wall of said piston. i t. t A

6. yIn a rotary compressor, al casing,.end plates attached to sa1d,cas1 ng'anY eccentric shaft-journall'ed lin'saidV end plates, a drum mounted. saidf casing, ay ring attachedv to saidy drum, aiournal -on said eccentric shaft, a d1sk formed on saidjournal, ya piston mountedin said drumbetween said ring'andsaid.y

disk, said piston having asmaller exterior diameter than the interior of said drum, a partition mounted insaid drurnfandconnected to said piston, and a spring of the open cylinder type having the coils thereof of varied diameter and spiralled around said eccentric shaft, certain coils of said spring being adapted to embrace the journal of said disk on the eccentric shaft and certain coils exerting pressure on the inner periphery of said piston, said spring maintaining the piston in contact With the inner periphery of said drum and to provide the oscillating oonnection between the piston and the eccentric shaft.

7. In a ro-tary compressor, a casing, end plates on said casing, oil retaining pockets on said end plates, journals in said end plates, ports between said pockets and said journals, a shaft supported in said journals, an eccentric on said shaft, a compression chamber supported in said casing a piston mounted in said compression chamber, said piston having a smaller exterior diameter than the interior of said compression chamber, and an open cylindrical spring having convolutions thereofspiralled around said eccentric shaft, said spring having convolutions contacting with the eccentric shaft and certain convolutions contacting With the inner Wall of said piston.

8. In a rotary compressor, a casing, end plates on said casing, oil retaining pockets on said end plates, journals in said end plates, port-s between said pockets and said journals, a shaft supported in said journals, an eccentric on said shaft, a compression chamber supported in said casing, a piston mounted in said compression chamber, said piston havingI a smaller exterior diameter than the interior of said compression chamber, a partition in said compression chamber and in connection With said piston, and an open cylindrical spring having convolutions thereof spiralled around said eccentric shaft, said spring having convolutions contacting with the eccentric shaft and certain convolutions contacting With the inner Wall of said piston.

9. A rotary compressor comprising a casing, a stationary drum mounted in said casing, a piston of smaller diameter than said drum, a rotatable eccentric shaft, an open cylindrical spring having the convolutions thereof spiralled around said eccentric shaft, said spring having convolutions of varied diameters with certain convolutions contacting With the eccentric shaft and certain convolutions contacting With the inner Wall of said piston, and means carried by said piston for engaging said drum to prevent rotation of said piston.

l0. A rotary compressor comprising a casing, a drum mounted in ksaid casing, end closures for said drum, a piston received in said drum, said piston being of smaller diameter than the inner Wall of said drum, an eccentric shaft mounted in said casing, and an open cylindrical spring having the convolutions thereof spiralled around said eccentric shaft, said spring having convolutions of varied diameters With certain convolutions contacting with said eccentric shaft and certain convolutions contacting with the inner Wall of said piston.

11. A rotary compressor comprising a casing, a drum mounted in said casing, end closures for said drum, a piston received in said drum, said piston being of smaller diameter than the inside diameter of said drum, an eccentric shaft mounted in said casing, an open cylindrical spring having the convolutions thereof spiralled around said eccentric shaft, said spring having convolutions of varied diameter with certain convolutions contacting With the eccentric shaft and the remainder contacting with the inner Wall of said piston, and a partition in said drum connected to said piston and adapted to divide said drum into two pockets.

In testimony whereof I vaffix my signature.

FRANK HORAWA. 

